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We don't just spin up communities about topics that interest us personally - all new communities go through the Site Proposal process here on Meta. The process includes making sure that there is a minimum number of people committed to using the proposed new community. If you believe that these topics would be well-received as proposals, then by all means post them as proposals.

In any case, please keep in mind that growth for growth's sake isn't our main goal. We want to support the needs and wants of the people using our network - not spinning up new communities that nobody is committed to on the hope that it'll attract users. 
Personally, despite being a relatively small group of people right now, I've found our TTRPG community quite useful.

We recognize that some of our communities are struggling for users, and the team is actively looking at ways to grow our user base in a reasonable way, such as promoting our existing communities to relevant audiences.